DEAR definition and meaning

Is 'dear both' correct in email when writing to two person? dear both 'When the waitress collected the plates, she smiled at both dishes and took them away as if they were both empty' · Dear Quentin, · Dear Customer, dear lottery 14 tarikh Persian, Turkish, and Urdu poets; as a symbol of complete surrender to the force of love, he is dear both to religious mystics and to secular poets

dear100 Both BSE Sensex and Nifty 50 closed the week flat with a gain of percent Dear Reader, An eventful week leading to the annual budget